You have heard of dirty jobs and dangerous jobs. There are jobs that some might say bite. For the spirited adventurer we are about to meet, every day at the office is a different animal. Abc's matt gutman joins him to clean, care, and medically examine some very special creatures. Going into the danger zone. The bees -- got my hood on. Reporter: Imagine your first day of the toughest of jobs, being every day on the job. Hey, hey, hey. Reporter: Subjected to initiation rights as rookies. It's not for the faint of heart or stomach. Hours turn into days, days turn into weeks. And imbedding for the day, and the team at safari in florida. Anacondas, in the amazon, tigers uncaged. Shark infested waters. I have done that. Knocking down the king of the jungle in his lion den, a little intimidating. One thing being on the other side of the bars. You are thinking, come on, just asleep. Another thing, actually being with it. Reporter: Hero, the kind of evolutionary specimen so strong they have to keep doping him up. After a few minutes hero stops pacing, eases himself down. Closes his eyes and looks like he is a sleep. Look at his eyes. He is gone. He is fading. But when handling a lion you better be sure. Our guide/protector for the day, brian dowling, grabs his stick and pokes him a couple times. While the veterinarian checks for any signs of movement. This is serious business. Sedating hero is a long process. You grab the tail. Me. Wow. Even the tail is heavy. Reporter: We help haul him into the examination room. One, two, three. Kind of heavy, huh. Reporter: Yeah. Nice kitty. 410 pounds. Nice kitty. Jeremy is only a little more experienced than I am. May be a rookie, look how useful he is. Reporter: Jeremy is hoping the latest job doesn't bite. These are the kids. This is how they play. Reporter: On his show the former airline pilot turned professional apprentice. I want you to put your hand under here. Reporter: Dumbs the friendly skies for his decidely more terrestrial gigs. Hold her. Get your hands out of there. Reporter: Tagging along with the professional, some bizarre and necessary ways. You come in here without animal experience. Yeah. Reporter: The premise of the show. Throw a there mall guy into a hectic situation. I grew up with two dogs. I think that's part of the fun of the show. I don't, I didn't grow up on a ranch. I grew up in southern california. Now I am doing these procedures. Whoa. I am on shows, teaching people how to milk goats. And I'm -- done it like once or twice before. So. Reporter:11 years since hero's last dental checkup. Which means, besides halitosis, there is a lot of work to do. Little of it glamorous. Doesn't look that bad considering he never had a dental. Reporter: Check this out. The dock tornadoes intubating the lion. -- The doctor is intubating the lion. Reporter: And some one has got to take his temperature. This is a job I am fully qualified for. This is the wrong end of the lie lie -- lie on to be near. When was the last time hero came in? Been a while. Probably ten years. Wow. He has heavy problems. A healthy animal. You don't need to knock him down. How are we doing on the list? Reporter: Of course, as the rookie, I have to gather a urine sample. And then the rookie was forced to do the stool sample. Ha-ha, are you kidding me. That's very funny. That was good. Good. Reporter: Unfortunately they weren't. But we will spare you. Once we are finished with hero. He will be groggy. Reporter: We head over to the giraffes to help beth draw blood. There we go. Here comes the blood. Reporter: How often do you have to do this? As long as they're healthy. We do it once ape year. Reporter: The way she is eating the bananas. Hold it outen front in front of him. Hea he will put his tongue out. How far can he do it? The zoological crash course is overwhelming. Jeremy its used to being put through the animal ringer. Doesn't seem to be anything you can't handle. They will continue off to challenge you. There is tons of stuff you can't handle. I try to say yes to everything. I am not stupid. Really comes about trusting the, the host you are dealing with. And, you know, if I see the look in their eye, I am okay. I pretty much trust I am okay. Reporter: While the jobs may not look glamorous, they are necessary. These professionals keep animals healthy, and grocery stores stocked, and streets safe. I guess that's the beauty of the show. It is bringing the every man into the world of the experts. Yeah, I think so. I hope that's one of the beauties of the show. People can sit there and watch it and think -- what's jeremy going to do? I don't have any experience. You know. I am doing a procedure with a lion. Out here with rhinos. I have no idea what I am doing. If there is one -- creeping up your backside. It is okay. Only the bull. Yeah. Is that the bull. Reporter: All in a day's work. I'm matt gutman, "nightline," west palm beach, florida.

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